Description

User gets an error for size of the request header too long error.
We have already tried the following
We have engaged our Windows Core team who have investigated the users profile in AD and believe the issue is caused by Microsoft IIS having a rather low Maximum Incoming Request Size by default. As the user is experiencing the issues in all Environments we have made a change in SIT to increase the MaxRequestBytes, and MaxFieldLength but unfortunately this has not resolved the issue.

Applies To

20x

Solution/Immediate Workaround

Below changes need to be made in order to get rid of error.

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters

MaxFieldLength
Default Value: 16384
Min – Max Value to set: 64 – 65534 (64kb) bytes
Sets an upper limit for each header. See MaxRequestBytes. This limit translates to approximately 32k characters for a URL.

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters

MaxRequestBytes
Default value: 16384
Min-Max value to set: 256 – 16777216 (16MB) bytes
Determines the upper limit for the total size of the Request line and the headers.
Its default setting is 16KB.

Please ensure the entry is created as the DWORD.